Digital Repository, ICF12, Ottawa 2009

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Susceptibility of Steels containing Cr, Ni, and Mo in H2S Environments
Mimoun Elboujdaini

Last modified: 2013-05-03


The HIC susceptibility of steels containing Cr, Ni, and Mo under stress and hydrogen
diffusion was been investigated by electrochemical methods. As the content of
alloying elements increased, the apparent hydrogen diffusion coeffi cient (D) and
threshold hydrogen permeation rate (Jth) for hydrogen embrittlement decreased.
Hydrogen content (Co) in the steel in NACE TM-0177 solutions increased due to
decreasing D with increased Cr content, although hydrogen permeability (J x L)
decreased, and the susceptibility to sulfi de stress cracking (SSC) increased as a
result. Moreover, Mo exhibited clear effect of decreasing J x L, and consequently
the resistance to SSC improved with increasing Cr content.

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